We're occasionally getting DNS errors when browsing the internet. I
have DNS running on an OES 11 server.

SUSE Linux Enterprise Server 11 (x86_64)
VERSION = 11
PATCHLEVEL = 2
LSB_VERSION="core-2.0-noarch:core-3.2-noarch:core-4.0-noarch:core-2.0-x86_64:core-3.2-x86_64:core-4.0-x86_64"
Novell Open Enterprise Server 11 (x86_64)
VERSION = 11.1
PATCHLEVEL = 1

I have my ISP's DNS servers in the forwarding list. So I'm
essentially providing internal DNS only and all external DNS queries
go to the ISP. I don't see anything in /var/log/messages and I don't
see any DNS specific logs. How would I troubleshoot this? It is
intermittent and I can't just make it happen on demand.

Ken